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TPS40210-Q1:升压电源

Part Number: TPS40210-Q1
Other Parts Discussed in Thread: TPS40210

请问一下,我现在用TPS40210做升压电路,(输入10v-14V,输出20V),现在遇到的问题是我的输出电压会随着输入电压的改变而改变,这是什么原因,麻烦帮我看一下。